Property dealer and buyer refused to return token money

A property dealer known to my parents showed them a property stating that it was two-side open property. when they went to see the property. He didn’t show us the other side of the house , stating that the sellers wife was ill and sleeping in the room. asked my parents to deposit the token money. my parents wanted to give ₹30,000 as the deposit but property and seller insisted to deposit ₹150,000. and asked us to come for a visit the next day. The next day when my parents went to see the house again, and found out that house was one side open. And when we asked for our money back, seller stated that they had spent the money and don’t have the money. tjey promised to pay back in 2 weeks but haven’t yet done it. it’s been over a month and when my parents went and asked them for the money. they refused that they are not going to return the money. im need assistance on this behalf. what options do we have and how legal is the bayana which one can buy from a stationary shop and put a ₹1 stamp?